1. Take the ashes of burning wood weeds, add a little water that just flooded plant ash, and then stir.

2. Remove impurities and ash, and generally filter with cloth to get the filtered mixed solution, that is, lye.

3. Concentrate the filtered lye and heat the lye to remove water, thus increasing the alkali concentration. The traditional method to judge the concentration is the egg floating water method.

4. Add the cooked lard into the concentrated alkaline water, heat the oil and alkali and stir until saponification is completed, and cook until it is very thick.

5. Make a mold, pour the boiled soap into a container, take it out after cooling, and let it stand for a while, and the soap is finished.